Circular saw



FIG. 1 is a perspective view of a circular saw embodying the new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIGS. 8-9 are each a perspective view thereof. 

CLAIM The ornamental design for a circular saw, as shown and described. 